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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"  Inherits="FirstPageCodeBehind" %>
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


    First Page Code-Behind


    
    

            id="Button1"
        Text="Click Here"
        OnClick="Button1_Click"
        Runat="server" />
    
            id="Label1"
        Runat="server" />
    

    


File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class FirstPageCodeBehind : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Click the Button";
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "Thanks!";
    }
}